The poll tax was a scamHistory, sad to say, is forgotten by too many people.For me, it’s a fascinating subject that makes me yearn for a time machine. If only I could return to this year or that year, I often think, to see history up close and personal.With my luck, someone will invent such a machine the year after I die, and it will be too late to enjoy the fun.Of course, there is always the paradox of time.What if a time traveler accidentally kills my great, great, great, great grandfather while on one of his time-travel adventures?History, though,